When McCoy gives Sarah April a tour of sickbay, he comments on how many of the tools there were designed by her. She replies that as the first medical officer aboard a ship equipped with warp drive, she frequently had to come up with new ideas. However, the SS Bonaventure was established as the first warp drive ship in 'The Time Trap'.

We have also seen that, in fact, there have been warp drive starships around for two centuries by the time of TAS; at the very least Phlox beats Sarah by a century in terms of medical officers aboard such ships, and it is highly likely that most if not all other warp driven ships had medical officers. However, we can't really blame TAS for this; since the series is not considered canonical future writers have deliberately chosen to go in different directions. It would be beyond even my nitpicking tastes to blame TAS for contradictions which were done deliberately decades in the future!

Great Moment :

Getting a bit of back story on the Enterprise.

Body Count :

Factoid :

This episode finally established that the first captain of the Enterprise was Robert April. Also his wife Sarah April was the Enterprise's first ship's doctor.

Karla 5's ship reaches warp 36 in this episode. By the official TOS scale this is 46,656 times the speed of light; fast enough to get from one star system to the next in around ten minutes or so.

This is one of a group of TAS episodes set after the last known Stardate for TOS.

Plotline

The Enterprise transports Commodore Robert April, the ship's first captain, to the planet Babel. When the ship passes through a nova it is thrown into an alternate universe where time runs backwards, and the crew begin to grow rapidly younger.